Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1994-05-13
1995-06-20
Ryznic, John E.
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
60711, 318611, 318625, 318676, F15B 104, G05B 1101
Patent
active
054252377
ABSTRACT:
A machine with a movable element, such as a machine tool and its spindle carrier, that is powered by a motive means to move the element is provided with a counterbalancing system having at least two counterforce means operably connected to the movable element for exerting a counterbalance force on the movable element in opposition to the first force and wherein a first one of the counterforce means has a controllable servomotor means. The control means controls the servomotor means so as to cause the counterbalancing system to exert a substantially constant counterbalance force on the movable element in opposition to the first force. The second one of the counterforce means may be a hydraulic means having a hydraulic cylinder operably connected to an accumulator and a hydraulic piston operably disposed in the cylinder and connected to the movable-element. The control means has a load sensor to sense a load on the movable element and convert the sensed load into a signal used to control the servomotor means which may be a torque controlled electric servomotor for controlling the vertical travel of a spindle carrier in machine tool.
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"Can an accumulator help you save hydraulic energy?", reprinted from the magazine of fluid power systems, Z. Zahid, Industrial Publishing Co., Copyright 1975.
"High Performance CNC Machining Center", Brochure from Cincinnati Milacron, Copyright 1990 Cincinnati Milacron Mkt. Co.
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Cincinnati Milacron Inc.
Farrell Thomas M.
Ryznic John E.
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